The fireworks designers know the physics and the chemistry and use that info to build fireworks that will explode in certain patterns(physics) and give off certain colors (chemistry) [https://www.businessinsider.com/how-fireworks-get-iconic-shapes-hearts-smiley-faces-2016-6](https://www.businessinsider.com/how-fireworks-get-iconic-shapes-hearts-smiley-faces-2016-6).
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